GelMA (Gelatin Methacryloyl), with 60% methacrylation and red fluorescence, is a modified version of GelMA created by grafting fluorescent molecules onto it. It serves as a scaffold, facilitating the design of tissue analogs ranging from the vascular system to cartilage and bone, thus promoting cell proliferation and diffusion. In contrast, GelMA, 60% methacrylation with green fluorescence, requires LAP as a photoinitiator to self-assemble into fibrous hydrogels and target bioactive adhesion sites, providing inherent support to tissue cells and promoting biodegradability. This compound finds applications in cell culture, 3D bioprinting, and tissue engineering.